Can Tokyo be a boy name?

Yes, of course. In my opinion, any Word can be a name, as long as it is a Word. For example, supercalifragilistic can also be a name (though it would be weird if you're calling him like: "Yo, wassup, Supercalifragilistic, anyways it would just be plain weirdness)

Don't really believe the things I wrote on the top, it's just supposed to be funny (it's a joke)